I think, as far as I understood you, this could also tie in, or rather is directly related with the prominent 'elitism' in the anime community. While anyone can say that someone else's fav. show is trash or what not, there definitely are very, very hardcore elitists who seem to be on a quest to desperately find the anime that they can say is perfect in every whatsoever (whatever that's supposed to mean...) while they try 'enlighten' everyone that everything else is trash.
They're usually not that hypocritical because they are pretty clear on what they think is 'objectively good' animation, characters, story, etc... and are usually fairly consistent about it, however I think their premise, that they, through whatever divine intervention, know what is good and what is not, is simply fallacious.
While the idea of discussing anime and somehow deducing what can be considered good (not what people have to like but of what we can say that it has good writing and what not) is important, these elitists seem to have done that by themselves rather than as part of the community and just split the community unnecessarily.